netdev - Re: [PATCH net-2.6] jme: Fix unmap error (Causing system freeze)

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Date:	Fri, 22 Jul 2011 09:45:42 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	cooldavid@...ldavid.org
Cc:	David Miller <davem@...emloft.net>,
	linux-netdev <netdev@...r.kernel.org>,
	Aries Lee <arieslee@...cron.com>,
	Devinchiu <devinchiu@...cron.com>,
	Jason Lamb <jason@...bhome.org>,
	Marcus Becker <marcus.disi@...il.com>,
	Marc Schiffbauer <mschiff@...too.org>,
	Jason Long <jason@...gsoftware.com>, stable@...nel.org
Subject: Re: [PATCH net-2.6] jme: Fix unmap error (Causing system freeze)

2011/7/21  <cooldavid@...ldavid.org>:
> From: Guo-Fu Tseng <cooldavid@...ldavid.org>
>
> This patch add the missing dma_unmap().
> Which solved the critical issue of system freeze on heavy load.
>
> Michal Miroslaw's rejected patch:
> [PATCH v2 10/46] net: jme: convert to generic DMA API
> Pointed out the issue also, thank you Michal.
> But the fix was incorrect. It would unmap needed address
> when low memory.

My patch also fixed another issue - from correctness point of view,
you should not use virt_to_page+dma_map_page here, but dma_map_single.

Best Regards,
Michał Mirosław
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